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The fragment of the polymer chain (a); Methyl-groups and solvent molecules are omitted, the dashed line corresponds to H-bond, atom index: ½ − x, ½ + y, ½ − z (A); ½ − x, -½ + y, ½ − z (B)), the EuO8 polyhedron (b) and crystal packing (c,d); H atoms at carbon atoms are omitted, the interatomic distances Eu···Eu are indicated by arrows) of 2.
